Includes 1:25k Explorer maps, 1:50k Landranger maps and 1:250k maps for the whole of Great Britain.

Garmin GB Discoverer Premium is the most detailed full coverage recreational map for Great Britain yet.
It includes the 1:25,000, 1:50,000 and 1:250,000 scale mapping from Ordnance Survey Great Britain, covering the whole region on just one 16 GB microSD/SD card.
The highest detail 1:25,000 scale maps include all required information for outdoor trip planning and orienteering, including terrain contours, elevations, summits, hiking trails, off road cycle routes, footpaths, bridleways, trig points, wooded areas, campsites, geographic points and more. High detail coverage of the Isle of Man is also included, courtesy of the Department of Infrastructure, Isle of Man.
The IOM is provided by HERE maps (a change from previous Discover offerings that use NavTEQ)

Navteq (styled as 'NAVTEQ') was an American Chicago-based provider of geographic information system (GIS) data and a major provider of base electronic navigable maps. The company was acquired by Nokia in 2007/2008, and fully merged into Nokia in 2011 to form part of the Here business unit.

From my point of view, I think the excuse/response from Garmin-HERE would be: "it is because some devices can't stand high quality images (raster maps)". When I said "can't stand" I mean, the speed to read and show the map on you device screen.

Personally I like to watch raster maps to plan a route on basecamp, but for real-life hiking and mainly biking I use vector maps because of the fast navigation through the map.

I don't have experience with a top handheld like a GPSMAP 64 or one of those with big touch screens, so I don't know if those devices can navigate fast and smoothly in real life (with raster maps).

***Nevertheless, those raster maps are too expensive to have that poor image quality.

10 years ago I loved raster maps in combination with OziExplorer CE on my Pocket PC. There was no other choice because for most European countries Garmin (vector)-topo maps didn't yet exist. On my first eTrex Vista I could load a few map-tiles on the 24MB internal memory and see some black lines on the screen representing Garmin's Metroguide maps. Good old times....
I still love raster maps but mainly to be viewed on a HD monitor, on my Oregon 600 I highly prefer vector topo's for a few obvious reasons:

Fast rendering

Great quality of detail nowadays

Multiple map-layers with different detail

It's sheer sharpness at all zoomlevels

Amount of data is much smaller

No ugly artefacts like we see on several raster maps, caused by too much jpg-compression

Possibility to create your own map representation by adapting the typ file. In my opinion one of the greatest improvements Garmin created for us but for some strange reason they never made an editor available themselves. Complete silence on Garmin's side!

Possibility to see two or even more maps at once by using transparancy

A lot of extra functions like autorouting, even on the smallest trail

Searchability is better

It's obvious that my opinion about raster maps has changed drastically this last decade in favor of vector maps.

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